iPhone 15 Pro Max Video Quality Issues

Hello,

I recently changed my iPhone 15 Pro Max camera settings to shoot in 4K at 30fps, and ever since making this switch, I've noticed a significant drop in video quality. Regardless of what camera settings I adjust (1080 30fps, 4k 60fps, etc), the issue persists. Specifically, my videos now have blurry lines and distortions, especially noticeable on buildings or other detailed objects, which never used to happen before. When I import the footage into my video editing software, the quality worsens even further (see attached photos for reference).

Since I work in social media and rely heavily on high-quality content, this is becoming a major issue for me. Has anyone experienced this or know how to resolve it?

iPhone 15 Pro Max in Camera:

Video when uploaded to Inshot: